{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2023-53247",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2023-53247",
    "idYear": 2023,
    "status": "PUBLISHED",
    "publishedAt": "2025-09-15T14:46:17.344Z",
    "updatedAt": "2026-05-11T19:41:05.419Z",
    "importedAt": "2026-10-24T01:57:03.413Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "btrfs: set_page_extent_mapped after read_folio in btrfs_cont_expand",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: set_page_extent_mapped after read_folio in btrfs_cont_expand\n\nWhile trying to get the subpage blocksize tests running, I hit the\nfollowing panic on generic/476\n\n  assertion failed: PagePrivate(page) && page->private, in fs/btrfs/subpage.c:229\n  kernel BUG at fs/btrfs/subpage.c:229!\n  Internal error: Oops - BUG: 00000000f2000800 [#1] SMP\n  CPU: 1 PID: 1453 Comm: fsstress Not tainted 6.4.0-rc7+ #12\n  Hardware name: QEMU KVM Virtual Machine, BIOS edk2-20230301gitf80f052277c8-26.fc38 03/01/2023\n  pstate: 61400005 (nZCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)\n  pc : btrfs_subpage_assert+0xbc/0xf0\n  lr : btrfs_subpage_assert+0xbc/0xf0\n  Call trace:\n   btrfs_subpage_assert+0xbc/0xf0\n   btrfs_subpage_clear_checked+0x38/0xc0\n   btrfs_page_clear_checked+0x48/0x98\n   btrfs_truncate_block+0x5d0/0x6a8\n   btrfs_cont_expand+0x5c/0x528\n   btrfs_write_check.isra.0+0xf8/0x150\n   btrfs_buffered_write+0xb4/0x760\n   btrfs_do_write_iter+0x2f8/0x4b0\n   btrfs_file_write_iter+0x1c/0x30\n   do_iter_readv_writev+0xc8/0x158\n   do_iter_write+0x9c/0x210\n   vfs_iter_write+0x24/0x40\n   iter_file_splice_write+0x224/0x390\n   direct_splice_actor+0x38/0x68\n   splice_direct_to_actor+0x12c/0x260\n   do_splice_direct+0x90/0xe8\n   generic_copy_file_range+0x50/0x90\n   vfs_copy_file_range+0x29c/0x470\n   __arm64_sys_copy_file_range+0xcc/0x498\n   invoke_syscall.constprop.0+0x80/0xd8\n   do_el0_svc+0x6c/0x168\n   el0_svc+0x50/0x1b0\n   el0t_64_sync_handler+0x114/0x120\n   el0t_64_sync+0x194/0x198\n\nThis happens because during btrfs_cont_expand we'll get a page, set it\nas mapped, and if it's not Uptodate we'll read it.  However between the\nread and re-locking the page we could have called release_folio() on the\npage, but left the page in the file mapping.  release_folio() can clear\nthe page private, and thus further down we blow up when we go to modify\nthe subpage bits.\n\nFix this by putting the set_page_extent_mapped() after the read.  This\nis safe because read_folio() will call set_page_extent_mapped() before\nit does the read, and then if we clear page private but leave it on the\nmapping we're completely safe re-setting set_page_extent_mapped().  With\nthis patch I can now run generic/476 without panicing.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "32443de3382be98c0a8b8f6f50d23da2e10c4117",
              "status": "affected",
              "versionType": "git",
              "lessThan": "0a5e0bc8e8618e32a6ca64450867628eb0a627bf"
            },
            {
              "version": "32443de3382be98c0a8b8f6f50d23da2e10c4117",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a5880e69cf7fe4a0bb1eabae02205352d1b59b7b"
            },
            {
              "version": "32443de3382be98c0a8b8f6f50d23da2e10c4117",
              "status": "affected",
              "versionType": "git",
              "lessThan": "17b17fcd6d446b95904a6929c40012ee7f0afc0c"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.12",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.12"
            },
            {
              "version": "6.1.42",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.4.7",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.4.*"
            },
            {
              "version": "6.5",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}